HP9100 I/O port

From: Tony Duell <ard_at_odin.phy.bris.ac.uk>
Date: Sun Aug 17 11:59:53 1997

Does anyone have any info on the I/O port on the back of the HP9100
desktop calculator? I believe that HP once produced a manual telling you
how to link up homebrew/custom peripherals, but I don't have it, alas

What I really need is a pinout, brief signal descriptions or timings, etc.
I want to be able to output a few on/off signals (I don't care if they're
binary or BCD encoded).

-tony
Received on Sun Aug 17 1997 - 11:59:53 BST